Vibrational Spectral Signatures of Crystalline Cellulose Using High Resolution Broadband Sum Frequency Generation Vibrational Spectroscopy (HR-BB-SFG-VS)

Libing Zhang, Zhou Lu, Luis Velarde, Li Fu, Yunqiao Pu, Arthur Ragauskas, Hong-Fei Wang, Bin Yang

Research output: Contribution to journalArticlepeer-review

18 Scopus Citations

Abstract

Both the C-H and O-H region spectra of crystalline cellulose were studied using the sub-wavenumber high-resolution broadband sum frequency generation vibrational spectroscopy (HR-BB-SFG-VS) for the first time. The resolution of HR-BB-SFG-VS is about 10-times better than conventional scanning SFG-VS and has the capability of measuring the intrinsic spectral lineshape and revealing many more spectral details. With HR-BB-SFG-VS, we found that in cellulose samples from different sources, including Avicel and cellulose crystals isolated from algae Valonia (I..alpha..) and tunicates (I..beta..), the spectral signatures in the O-H region were unique for the two allomorphs, i.e. I..alpha.. and I..beta.., while the spectral signatures in the C-H regions varied in all samples examined. Even though the origin of the different spectral signatures of the crystalline cellulose in the O-H and C-H vibrational frequency regions are yet to be correlated to the structure of cellulose, these results lead to new spectroscopic methods and opportunities to classify and to understand the basic crystalline structures, as well as variations in polymorphism of the crystalline cellulose.
Original languageAmerican English
Pages (from-to)1469-1484
Number of pages16
JournalCellulose
Volume22
Issue number3
DOIs
StatePublished - 2015

NREL Publication Number

  • NREL/JA-2700-64626

Keywords

  • Avicel
  • cellulose
  • high resolution broadband sum frequency generation vibrational spectroscopy (HR-BB-SFG-VS)

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